I love simple APIs, and this one eats the pie. With the Google Chart API you can build a URL that will dynamically create a chart for you. This service is used internally for Google Finance, Google Video, and beyond. Now, anyone can use it!

I want to say this is awesome but reading their usage policy it only allows 50,000 uses per 24 hours.

I have been using a Flash Graphing system for the last couple years that does a pretty good job but at the same time its pretty big and bulky and creating anything half-what-useful is a lot of trial and error.

Seeing the above Chart API had me excited, I like the graph look, the way to call it looks nice and easy, lots of functionality available, but the 50K just isnt enough, the application I work on gets well over 100K page loads where graphs are located.

For shame!

Comment by Bundus — December 6, 2007

Bundus, try the jQuery chart-plugin

Comment by DarkRat — December 6, 2007

The limit is per user: “…query limit of 50,000 queries per user per day”

Comment by Les — December 6, 2007

;-(
I thought that it will allow to create charts like charts from google analytic.